I have set these carriers up, when testing the checkout and when choosing the deliver option the price for The Paid for service (UK Next day Delivery) the cost comes up as free but should be £5.99. I have checked the carrier option in my admin panel and the FREE shipping is off on that particular option and the price in the box is £5.99....

can anybody help me with this please?

I do not have a carrier module I am just using the prestashop carrier options